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    JLashhhh's Avatar
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    help with my box

    so i built my own ported box for one alpine type R 12" the box has 2cubic feet of air and its tuned at 35hz. I constructed this out of 3/4" MFD board. its held together by some wood glue 1 1/2inch dry wall screws ( may be 2" im not sure) and all the seams are sealed with wood putty. so basically the problem im having is when my sub hits hard it makes like a creaking noise ( not cracking ) basically the kinda noise a old hardwood floor usually makes when you step on it. Any ideas whats causing this and how to fix it?







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    Re: help with my box

    didnt seal it quite good enough? or maybe if the box is not completely structurally sound the box flexes enough shifting the joints causing the noise you hear





    Refs: Rio, DbzArson, goodstuff, Worstenemy453


    Quote Originally Posted by Altec View Post
    Then obviously I am asking the wrong person, because you don't know how to hook up subs if they sounded like "****". Maybe learn your ohms and your diagrams before you call something ****. Learn to make boxes to specs and use the right wires and its called dynomat. Then maybe your car wouldn't of sounded like ****, yeah?

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    Re: help with my box

    this is prolly it... when i first built it it didnt do it but after about a week of use it started this... any suggestions on how to make it more structurally sound




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    Re: help with my box

    it sounds like it started to loosen itself apart after you started running the sub in it. well it depends how you buit it but bracing is always good but you cant add bracing without changing the tuning and airspace. and for a single? twelve box you shouldnt really even need extra bracing or double baffeling





    Refs: Rio, DbzArson, goodstuff, Worstenemy453


    Quote Originally Posted by Altec View Post
    Then obviously I am asking the wrong person, because you don't know how to hook up subs if they sounded like "****". Maybe learn your ohms and your diagrams before you call something ****. Learn to make boxes to specs and use the right wires and its called dynomat. Then maybe your car wouldn't of sounded like ****, yeah?

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    Re: help with my box

    Wood putty is not a good sealer for joints in a sub enclosure. Its brittle and not very adhesive. All the joined edges should be glued with a good carpenters wood glue. If you have big gaps fill them with silicone adhesive. Dont use liquid nails. I have used reinforced fiberglass body filler to fill gaps before with good results. You might also need some bracing in the box if you havent installed any. Keeps the box flexing to a minimum.



    My System:
    Alpine 9856 head unit
    Alpine SPS-17C2 6.5 coaxial front doors
    Polk Audio db 651 6.5 coaxial rear doors
    Alpine Type-R 10" D4 sub in custom ported enclosure
    Alpine MRD M605 amplifier

    Refs: Assman (purchase), PsychoTheRapist (purchase), wasted ink (trade)

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    Re: help with my box

    it really doesnt do it constantly on every song just when it hits really hard but most of the songs i listen to with my sub have alot of the bass that causes the sub to hit hard especially 24/27 (Kobe/Lebron) by young jeezy that just makes it creak like no other




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    Re: help with my box

    well i guess ill try some bracing on the inside of the box ill try to just add it in key areas and keep it to a min so i dont mess up my air space and port tune to much




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    Re: help with my box

    Also dont know if you predrilled the holes for your screws or not. If you didnt you could have split the MDF in a few places. That could cause the creaking too. One side of the split moving when the sub hits hard.



    My System:
    Alpine 9856 head unit
    Alpine SPS-17C2 6.5 coaxial front doors
    Polk Audio db 651 6.5 coaxial rear doors
    Alpine Type-R 10" D4 sub in custom ported enclosure
    Alpine MRD M605 amplifier

    Refs: Assman (purchase), PsychoTheRapist (purchase), wasted ink (trade)

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    Re: help with my box

    yes i predrilled my holes but i did notice when i removed my sub that were the top and bottom screw go the wood is split some




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    Re: help with my box

    dont bother with bracing (slugs) just go buy a box of 1 5/8 deck screws (grey coated ) not drywall screws / they do not hold mdf / get deck screws and screw that bish every where if still have gaps use silicone/caulk to seal it



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